#4421: Compilation performance regression
---------------------------------+------------------------------------------
Reporter: simonmar | Owner: igloo
Type: bug | Status: new
Priority: highest | Milestone: 7.0.1
Component: Compiler | Version: 6.12.3
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
---------------------------------+------------------------------------------
Comment(by igloo):
With the patch, I was seeing
{{{
70,966,109,224 bytes allocated in the heap
10,517,401,920 bytes copied during GC
88,885,320 bytes maximum residency (67 sample(s))
19,679,064 bytes maximum slop
273 MB total memory in use (0 MB lost due to fragmentation)
INIT time 0.00s ( 0.00s elapsed)
MUT time 74.56s ( 77.79s elapsed)
GC time 78.38s ( 78.31s elapsed)
EXIT time 0.00s ( 0.00s elapsed)
Total time 152.95s (156.10s elapsed)
}}}
but after
{{{
Wed Oct 20 14:15:39 BST 2010 Ian Lynagh <[email protected]>
* Avoid hanging on to old unfoldings; fixes #4367 (compiler space
regression)
Wed Oct 20 15:37:10 BST 2010 Ian Lynagh <[email protected]>
* Don't seq unfoldings
}}}
I see
{{{
46,804,639,544 bytes allocated in the heap
7,954,212,312 bytes copied during GC
123,843,728 bytes maximum residency (47 sample(s))
20,877,992 bytes maximum slop
377 MB total memory in use (0 MB lost due to fragmentation)
INIT time 0.00s ( 0.00s elapsed)
MUT time 54.89s ( 58.56s elapsed)
GC time 55.02s ( 55.03s elapsed)
EXIT time 0.00s ( 0.00s elapsed)
Total time 109.91s (113.59s elapsed)
}}}
so time and allocs look good, but total mem usage is high (but not as high
as it used to be). Presumably we still sometimes retain old unfoldings,
but not in cases that happen with the #4367 testcase.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4421#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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